Materials Literature
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The most important experimental differences between solid crystals and liquid crystals with three-dimensional order are suggested to be that liquid crystals with optically active molecules form twisted structures, whereas solid crystals do not, and that similar liquid crystal phases of different compounds mix in all p…
It is shown that the kinetic order n and the average soil-removal rate coefficient k of particulate soil detergency can be determined by measuring soil removal during a constant time interval Δ t as a function of soil content of the fabric. With iron oxide as the model soil on cotton poplin and polyester fabrics, the…
To study the effect of age on amino acid composition of human skin collagen, skins from 8 women aged 0 to 93 were extracted with acetone and EDTA and then gelatinized. Gelatin was purified by extraction with chloroform-methanol and DEAE cellulose chromatography. Hydroxyproline was spectrophotometrically determined and…
The nuclear quadrupole interaction at substitutional Ta atoms in the alloy system Hf x Zr 1-x has been investigated over the entire range of composition by time differential perturbed angular correlations (TDPAC). Source configurations investigated include oriented and randomised single crystals as well as textured, c…
The angular dependence of light scattering in nematic-cholesteric mixtures with positive dielectric anisotropy was measured; the quiescent transparent satate S , the focal-conic state F , the storage focal-conic state F 0 , and the field-induced nematic state H were investigated. The F 0 state showed Bragg scattering…
The existence of a siqnificant exponentially decaying dc transient in the primary current of a conventional current transformer leads to large transient values of core flux. Protective scheme design is therefore subjected to constraints, either that ct saturation be tolerated or that larger ct's incapable of saturatio…
Abstract Heat effects and structural transformations in amorphous crystallizable poly(ethylene terephthalate) (PET) during uniaxial stretching accompanied by neck formation, have been investigated by calorimetric and x‐ray methods over a wide range of temperatures and deformation rates. At small deformation (not excee…
Abstract Sample‐charging phenomena arising in the ESCA experiment have been investigated for a series of polymers. For samples studied as films or powders mounted insulated from the spectrometer probe and for gold under similar conditions it is shown that over a wide range of operating conditions, equilibrium charging…
Abstract— The spectral characteristics of the emission observed from tropolone, α‐methoxy‐tropone and colchicine in EPA at 77 K are reported. Luminescence polarization, lifetime, quantum yield and energy transfer experiments provide evidence that the luminescence observed is S 1 → S 0 fluorescence and that the lowest…
Electrochemical techniques have been applied to the study of the effect of corrosion on the wear patterns in a 10 cm diameter pilot plant slurry pipeline carrying a freely settling Newtonion slurry of 20 Vol% 30 to 50 mesh silica sand in water. Comparison of specimens with and without cathodic protection made after pe…
The leaching kinetics of lead glasses (25 to 35 mol% PbO‐75 to 65 mol% SiO 2 ; some with K 2 O and A1 2 O 3 , additions) were determined in 10% acetic acid. Except for a ternary glass (SiO 2 ‐PbO‐K 2 O) which had a linear dependence on time, all compositions exhibited a linear dependence on the square root of time for…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrostructure of Poly(1-phenylbutadiene) Prepared by Anionic InitiatorsToshimitsu Suzuki, Yasushi Tsuji, and Yoshinobu TakegamiCite this: Macromolecules 1978, 11, 4, 639–644Publication Date (Print):July 1, 1978Publication History Published online1 May 2002Published inissue…
Abstract The new compounds CaMn 2 As 2 , SrMn 2 As 2 and BaMn 2 As 2 have been prepared and their structures determined. The crystallographic data are (pm): CaMn 2 As 2 : P3̄m 1, a = 423 ± 1, c = 703 ± 1, c/a = 1.66 SrMri2As2: P3̄m 1, a = 429±1, c = 732 ± 1, c/a = 1.70 BaMn 2 As 2 : I4/mmm, a = 415 ± 2, c = 1347 ± 2,…
The magnetic susceptibility ($\ensuremath{\chi}$), electrical resistivity ($\ensuremath{\rho}$), and thermoelectric power ($S$) of bis(tetrathiotetracene)-triiodide were measured for $9<T<300$ K. Bis(tetrathiotetracene)-triiodide crystals were synthesized by vapor-phase cosublimation. X-ray crystal-structure det…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTN-aminoporphyrins. Preparation and metal complexes. Structure of N-tosylamino-5,10,15,20-tetraphenylporphinatonickel(II)H. J. Callot, B. Chevrier, and R. WeissCite this: J. Am. Chem. Soc. 1978, 100, 15, 4733–4741Publication Date (Print):July 1, 1978Publication History Publis…
Abstract The Eckart frame is a frame of orthonormal vectors e i , i = 1, 2, 3, which follow a vibrating molecule while it rotates. The frame is orientated by the so‐called Eckart condition, which Eckart found by requiring the Coriolis interaction to be minimal. In the present paper we shall see that Eckart's frame als…
The temperature dependences of the saturation magnetization of amorphous ferrimagnetic Co-Gd-Mo-Ar thin films have been analyzed in terms of the mean-field theory. This analysis yields the spin values of Co and the effective exchange interaction energies between Co-Co and Co-Gd atom pairs, which are then correlated wi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe structure of water absorbed in collagenC. A. J. Hoeve and A. S. TataCite this: J. Phys. Chem. 1978, 82, 14, 1660–1663Publication Date (Print):July 1, 1978Publication History Published online1 May 2002Published inissue 1 July 1978https://pubs.acs.org/doi/10.1021/j100503a0…
Abstract The kinetics of craze growth from sharp cracks in polystyrene (PS) and poly(methyl methacrylate) (PMMA) in contact with liquid methanol were measured with time‐lapse photography as a function of the stress intensity factor K I . At high K I the craze length in both systems increases as √ t if the sides of the…
Homogeneous pseudobinary compound series of high magnetic anisotropy exhibit giant intrinsic magnetic hardness at cryogenic temperatures. This work presents data on the temperature and composition dependence of coercive force (${\mathrm{H}}_{c}$) in $\mathrm{Sm}{\mathrm{Co}}_{5\ensuremath{-}x}{\mathrm{Ni}}_{x}$ and $\…